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EXPLANATION OF PLATE XXXI. 
KNOXVILLE AND CHICO (CRETACEOUS) FOSSILS. 
Aucella crassicollis Keyserling, L.S.J.U., No. 1014. View of left valve; 
latitude, 85 mm. X 1. Locality No. 170, Knoxville formation, lower 
Cretaceous, Pulgas Creek, 13 miles west-northwest of Redwood 
City. A characteristic species of the Knoxville. 
. Amberleya dilleri Stanton, L.S.J.U., No. 1011. Back view; altitude, 
16 mm. X 2. Locality No. 170, same as fig. 1. Also characteristic 
of the Knoxville. 
. Mactra stantoni, new species, Cat. No. 31001, U.S.N.M. Left valve; 
altitude, 88 mm. X 1. Locality No. 27, on coast 1 mile north of 
Pigeon Point, p. 357. 
. Glycymeris veatchii Gabb, L.S.J.U., No. 1004. View showing umbones and 
hinge area; altitude, 66 mm. X 1. Locality No. 96, Chico formation, 
upper Cretaceous, Bolsa Point, 14; miles north of Pigeon Point. 
Usually present in Chico faunas. 
. Trigonia evansana Meek, Cat. No. 81002, U.S.N.M. View of umbones 
and hinge area of imperfect valves; longitude, 109 mm. X 1. Local- 
ity No. 26, 14 miles east-southeast of Pigeon Point. <A _ species 
characteristic of the Chico formation. 
». Arca vancouverensis Meek, Cat. No. 31008, U.S.N.M. Left valve; longi- 
tude, 31 mm. X 13. Locality No. 26, same as fig. 5. An abundant 
Chico fossil. 
. Turritella pescaderoensis, new species, type, L.S.J.U., No. 999. Back 
view ; altitude, 46 mm. X 1. Locality No. 27A, 1 mile south of the 
mouth of Arroyo de los Frijoles, p. 358. 
